Mixing apparatus



Feb. 3, 1925- 1,524,854

F. A. BROWN E MIXING APPARATUS Filed Aug. 5, 1921 I WI'INESSFS; INVENTOR:

5 ML (OM ATTORK'EYS.

Patented Feb. 3, 1925.

.UNITED STATES PATENT OFFICE.

FRANK A. BROWNE, F WAYNE, PENNSYLVANIA, ASSIGNOR TO BARBER ASPHALT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF -WEST VIR- GINIA.

MIXING APPARATUS.

Application filed August 5, 1921. Serial No. 490,171.

To all whom it may concern:

Be it known that I, FRANK A. BRowNn,

a citizen of the United States, residing in Wayne, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Mixin Apparatus, whereof the following is a specification, reference'being had to the accompanying drawings.

My invention relates generally to mixing apparatus and more especially to that type adapted for mixing materials used. in the manufacture of so called prepared roofings. In this art, webs usually of felt saturated with a suitable bituminous waterproofing compound are used as bases to which appropriate finishing surfacings are subsequently applied for the purpose of rendering the roofings moredurable in use and of securing contrasting-or variegated color effects. Such surfacings may be either of plain asphaltum or mixtures of asphaltum and finely divided mineral matter of different sorts such as sand, slate, etc.

- Amongst the objects-of my invention are to enable the operation of mixing surfacing materials such as above noted, to be carried on continuously; and to make it possible to cont-r01 the relative quantities of the ingredients used so that any desired proportions mag be had. I

ther objects and attendant advantages of my invention will become readily apparpnt from the detailed description which folows:

In the drawings, Fig. I is a longitudinal sectional view through a mixing apparatus conveniently embodying my invention; and

Fig. II is a staggered vertical cross section of the same viewed in the direction of the arrows II--II in Fig. I; and Fig. III is a diagrammatic. showing illustrative of the relative disposition of certain agitating elements and end propeller blades hereinafter fully described.

The apparatus herein shown as typical of my invention'comprises a receptacle 1 which is in the form of a horizontally disposed cylinder having an enveloping .jacket'2 for the circulation of a suitable fluid heating medium whereby the contents of the receptacle are maintained in a molten or fluid condition. Extending axially through the receptacle 1 is a shaft 3 which is supported for rotation in bearings H mounte upon suitable pedestals or standards 5, 5 at the exterior. At the regions where the extremisite one another with respect to a central split hub. Alternate pairs of the elements are preferably arranged at right angles, relatively, so that agitation'set up by the paddles is rendered the more uniform. The

portion of the shaft 3 which lies within the receptacle is square in cross, section as best shown in Fig. II of the drawings and the bosses of ,the agitating elements 10 are correspondingly apertured to fit accurately thereon. Clamp bolts 11, 11 are herein shown as suggestive of means for securing the agitating elements 10 to the shaft. By this construction, the possibility of work ing loose, or relative displacement of said.

elements is reduced to a minimum.

In addition to the agitating elements 10,

10, I have mounted to the shaft 3 directly adjacent the end walls of t he receptacle 1, propellers 12, 12. operative in opposition to one another and tend to direct the materials being mixed to ward the center of the receptacle to maintain them within the province or field of the intermediate paddles or agitating elements 10, 10 so that thorough agitation and mixing are assured. The propellers 12 are moreover, further functional in directing the material in a direction.away from the deflecting disks 6, 6 thereby assisting in preventing escape or leakage through the channels previously pointed out. The shaft 3 may be driven by. any suitable means such for example as a sprocket wheel 13 capable of being coordinated, by chain, with any convenientsource of power.

Molten asphaltum is introduced to the receptacle 1 under suflicient pressure to induce continuousflow, through a fitting 15 which to that already ment-ione aid fitting 15 These propellers 12 are ill) has an inclined or gravity flow duct 17 which discharges into the receptacle 1 through an aligned opening in the right hand end wall of the latter. The molten asphaltum is conducted to the mixing apparatus through a. jacketed conduit 18 which leads from a suitable source of supply (not shown) and discharges into the duct 17 by way of a branch 19.

The material, after mixing, leaves the receptacle through an outlet in the form of a stand pipe 20 which discharges directly into a conduit 21 similar to the conduit 18 above referred to. Said stand pipe 20, it will be noted, is located at the end of the receptacle 1 opposite to that at which the latter is charged so that short circuiting is positively prevented. Said stand pipe 20 also serves to maintain a constant quantity of the ,material in the receptacle so as to insure thorough mixing under the agitation of the paddles. The receptacle 1 is further provided with a pipe 22' through which it may be completely drained when desired.

The fitting 15 is surmounted by a device 25 for introducing to the receptacle any pulverulent or granular material which is to be mixed with the molten bitumen. Said device 25 comprises a hopper 26 whose outlet communicates directly with the duct 17. Horizontally disposed across the outlet of the hopper is a fluted measuring rotor 27 secured to shaft 281 Said shaft 28 is journalled in appropriate bearings in opposite walls of the hopper 26, and has fixed to one of its ends a sprocket wheel 29, which, in practice, transmitting motion at different speeds so that rotation of the flute-d element 27 may be varied to control the liberation of the pulverulent or granular material in difi'erent proportions to the asphaltum flowing through the duct 17. In order to secure better control in measurement of the material, the lower wall or bottom of the hopper-'26 is carried well across the outlet beneath the fluted rotor 27 as clearly shown in Fig. II. In cases where needed, a multiplicity oi" the devices 25 may obviously be employed in introducing as many other different ingredients.

lVhile I have described my invention as .being advantageously applicable to mixing of materials used in the manufacture of bituminous roofings, it is of course to be understood that it may be employed with equal advantage in other arts.

Having thus described my invention, I

claim is driven by means capable of branch formed with the conduitand intersecting the channel of the same through which to introduce powdered ingredients for admixture with the fluid stream, the velocity of the stream creating a partial vacuum in the branch to draw the ingredients into the stream.

2. A mixing apparatus comprising a receptacle through which the materials to be mixed are continuously passed; an inlet at one end of the trough through which the materials are introduced to the receptacle; and an outlet at the opposite end of said trough through which the materials are discharged, the mouth of said outlet extending well above the bottom of the receptacle to insure at all times, maintenance of a definite quantity of the materials within the receptacle to insure thorough mixing.

3. In a mixing apparatus including a,

the receptacle, a normal outlet comprising a stand pipe extending into the receptacle to ensure retention of a predetermined quantity of material in the receptacle and to permit constant drainage of mixed material, and an auxiliary outlet means to completely drain the receptacle when desired.

5. In a mixing apparatus of the type described, the combination of dished battle disks accommodated in complementary rccessions about the mixing receptacle journals, and reversely pitched propellers adseepage of material therethrough.

6.,In a mixing apparatus of the type described, the combination of dished baille disks accommodated in complementary recessions concentric with the mixing apparatus journals, overhung guard plates partly closing in said disks, and reversely pitched propellers adjoining said journals operative .to force material away therefrom whereby seepage through said journals is prevented.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this fourth day of August, 1921.

FRANK A. BROWNE. lVitnesses:

JAMES H. BELL, E. L. FULLERTON,

oining said journals operative to prevent 

